31
Dorel Alain P: Rotary steerable well drilling system utilizing sliding sleeve. Schlumberger Holdings, Schlumberger Services Petrol, June 14, 2000: EP1008717-A1 (19 worldwide citation)

An actively controlled rotary steerable drilling system for directional drilling of wells, the system having a rotary drive component rotatable within a tubular sliding tool collar that incorporates elastic anti-rotation members to maintain a coupled relation with the borehole wall during drilling. ...


32
Kostek Sergio, Chang Shu Kong, Mcdaniel Gordon L, Plona Thomas, Randall Curtis, Masson Jean Pierre, Mayes James C, Hsu Kai: Method of sonic logging while drilling a borehole traversing an earth formation.. Anadrill Int, Schlumberger Services Petrol, November 2, 1995: EP0679910-A2 (18 worldwide citation)

The present invention is directed to sonic logging while drilling. A transmitter (34) and at least one receiver (36) are mounted on a drill collar (32) for performing sonic investigations of the formation traversed by a borehole. It has been discovered that a drill collar has a natural stop band or ...


33
Kosmala Alexandre G E, Pisoni Attilio C, Pirovolou Dimitros K, Kotsonis Spyro J: Method and apparatus for steering a directional drilling tool. Schlumberger Holdings, Schlumberger Services Petrol, June 13, 2001: EP1106777-A1 (18 worldwide citation)

An actively controlled rotary steerable drilling system for directional drilling of wells having a tool collar rotated by a drill string during well drilling. A bit shaft has an upper portion within the tool collar and a lower end extending from the collar and supporting a drill bit. The bit shaft i ...


34
Kurkjian Andrew, Macdougall Thomas, Ladue Duane, Jaroska Miles, Flores Aaron: Apparatus and method for sampling an earth formation through a cased borehole. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, August 27, 1997: EP0791723-A1 (18 worldwide citation)

An apparatus (12) is disclosed for perforating, testing and resealing casing (11) in an earth formation borehole (10). The apparatus is moveable through the casing. The apparatus can also be mounted on a wireline, on tubing (13) or on both. A perforating device is mounted in the apparatus for produc ...


35
Bedel Jean Philippe, Card Roger, Vidick Benoit: Low density, fibre-reinforced cement composition. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, Sofitech, February 19, 2003: EP1284248-A1 (17 worldwide citation)

A fibre-reinforced, low density cement system for the control of lost circulation during the drilling of subterranean wells, generally comprising a cement particle mixture having a specific granulometric characterization and alkaline resistant fibres, such as fibres composed of glass having a high z ...


36
Dorel Alain P: Apparatus and method for directional drilling using coiled tubing. Anadrill Int, Schlumberger Services Petrol, August 6, 1997: EP0787886-A2 (17 worldwide citation)

A steerable directional drilling tool assembly includes a bent housing (12) defining a bend angle and having a mud motor (13) in its upper section and a drill bit (15) below its lower section, an orienting tool (17) rotatably coupled to such upper section and suspended on coiled tubing (20) that ext ...


37
Malone David L, Neme Eric E: Flow segregator for multi-drain well completion. Anadrill Int, Schlumberger Services Petrol, July 30, 1997: EP0786578-A2 (17 worldwide citation)

A multi-lateral well completion system segregates and prevents commingling of the production fluids flowing from a plurality of lateral wellbores which extend outward from a main wellbore. The system includes a segregator body member that is positioned and oriented in the main wellbore adjacent the ...


38
Murphy William F, Reischer Andrew J, Orrange John J, Bryant Ian D, Fazio Alison M: Method and apparatus for creating, testing, and modifying geological subsurface models. Schlumberger, Schlumberger Technology, Schlumberger Services Petrol, Schlumberger Holdings, September 20, 2000: EP1036341-A1 (17 worldwide citation)

The present invention relates to method(s)/apparatus for creating, testing, and modifying computerized models of the earth's subsurface by, for example, providing computer-implemented tools which allow user(s) to selectively access and display pertinent geophysical, geographical, and archive data an ...


39
Froelich Benoit: Apparatus and method for acoustically investigating a borehole by using a phased array sensor. Schlumberger Services Petrol, October 1, 2003: EP1348954-A1 (16 worldwide citation)

A tool for investigating a borehole comprises one or two matrices of acoustical transducer elements organised on respective cylindrical surfaces as phased arrays. Each transducer element of the respective matrices may be individually excited or measured. The tool allows for generation of a number of ...


40
Thiercelin Marc Jean: Downhole measurements using very short fractures.. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, June 17, 1992: EP0490421-A1 (16 worldwide citation)

A method of performing small scale micro hydraulic fracturing in which fluid is pumped into the test interval until the initiation of a fracture is indicated, immediately after which fluid is pumped out of the interval so as to prevent propagation of the fracture and allow closure thereof, the porti ...